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61.go
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43 lines (37 loc) · 840 Bytes
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package problem
/*
给定一个链表,旋转链表,将链表每个节点向右移动 k 个位置,其中 k 是非负数。
示例 1:
输入: 1->2->3->4->5->NULL, k = 2
输出: 4->5->1->2->3->NULL
解释:
向右旋转 1 步: 5->1->2->3->4->NULL
向右旋转 2 步: 4->5->1->2->3->NULL
示例 2:
输入: 0->1->2->NULL, k = 4
输出: 2->0->1->NULL
解释:
向右旋转 1 步: 2->0->1->NULL
向右旋转 2 步: 1->2->0->NULL
向右旋转 3 步: 0->1->2->NULL
向右旋转 4 步: 2->0->1->NULL
*/
func rotateRight(head *ListNode, k int) *ListNode {
if head == nil {
return nil
}
newHead := head
length := 1
for head.Next != nil {
length++
head = head.Next
}
head.Next = newHead
newPos := length - k%length
for i := 1; i < newPos; i++ {
newHead = newHead.Next
}
res := newHead.Next
newHead.Next = nil
return res
}